Article
Chemistry, Physical
Elena Pikalova, Alexander Kolchugin, Victor Tsvinkinberg, Vladimir Sereda, Anton Khrustov, Elena Filonova
Summary: This study compares the oxygen content, thermal expansion, electrical conductivity, and electrochemical performance of La(1.6)Ln(0.4)NiO(4+delta) complex oxides. The highest conductivity is found in the La1.6Sm0.4NiO4+delta sample. The stability of the electrode structure is demonstrated by scanning electron microscopy. The La1.6Eu0.4NiO4+delta electrode shows the minimum polarization resistance.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Environmental
Sung Ryul Choi, John-In Lee, Hyunyoung Park, Sung Won Lee, Dong Yeong Kim, Won Young An, Jung Hyun Kim, Jongsoon Kim, Hyun-Seok Cho, Jun-Young Park
Summary: A systematic study was conducted on Ruddlesden-Popper structured materials for their catalytic performance in oxygen evolution and reduction reactions, resulting in the development of highly efficient bifunctional oxygen catalysts La5Ni4O13-δ and La5Ni3CoO13-δ with outstanding electrocatalytic activity.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Multidisciplinary Sciences
Wuhao Chen, Xiaoli Huang, Dmitrii V. Semenok, Su Chen, Di Zhou, Kexin Zhang, Artem R. Oganov, Tian Cui
Summary: This study successfully synthesized hcp-(La,Ce)H9-10 at 113GPa and observed high-temperature superconductivity at 176K and 100GPa, with an extrapolated upper critical field of 235T. The superconducting properties of La-Ce-H were significantly enhanced compared to the binary La-H and Ce-H compounds, indicating the potential of solid solution for improving superconductors.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Evangeline Jafneel Nixon, Rajalakshmi Sakthivel, Zeid Abdullah ALOthman, Pattan-Siddappa Ganesh, Ren-Jei Chung
Summary: Contemporary food marketing focuses on flavor enhancers rather than the nutritional value of food. An electrochemical sensor was developed using a modified electrode made of La2NiO4 functionalized carbon nanofiber (f-CNF) for detecting vanillin in food samples. The sensor exhibited high sensitivity (0.2899 mu A center dot mu M-1 center dot cm(-2)) and low limit of detection (6 nM) through electrochemical analysis, making it a promising tool for vanillin detection in food.
Article
Engineering, Electrical & Electronic
Rebecca Cervasio, Luca Tomarchio, Marine Verseils, Jean-Blaise Brubach, Salvatore Macis, Shengwei Zeng, Ariando Ariando, Pascale Roy, Stefano Lupi
Summary: The recent discovery of superconductivity in infinite-layer nickelates is expected to help solve the puzzle of high Tc values in oxides. In this study, the optical properties of a Nd0.8Sr0.2NiO2 film were measured using optical and terahertz spectroscopy above and below the critical temperature. The results show the presence of a superconducting energy gap below Tc.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Vishal Sharma, Inderpal Singh, Sunil K. Arora, Florencio Sanchez, Fouran Singh, Shilpa Tripathi, S. N. Jha
Summary: We investigated the impact of Ag15+ (200 MeV) ion irradiation on the surface electronic structure of epitaxial LaNiO3 films on (100) oriented LaAlO3 substrates by analyzing La (4d to 4f) and Ni (3p to 3d) photoemission transitions. Results showed slight enhancement in the spectral features for La (4d to 4f) transitions, but no enhancement for Ni (3p to 3d) transitions in both pristine and irradiated samples. Changes in constant initial state (CIS) spectra for La (4d to 4f) transitions and the presence of surface states near the Fermi level in Ni (3p to 3d) transitions were observed, with different ion doses associated with oxygen vacancies. Interestingly, the density of states (DOS) at the Fermi level in Ni (3p to 3d) transition spectra increased systematically with the irradiation dose, and a correlation between DOS at the Fermi level and surface states was found. The highest dose sample exhibited surface states with the highest DOS at the Fermi level, indicating an upward shift of surface states with increasing irradiation dose.
SURFACES AND INTERFACES
(2023)
Article
Physics, Multidisciplinary
Matteo Rossi, Motoki Osada, Jaewon Choi, Stefano Agrestini, Daniel Jost, Yonghun Lee, Haiyu Lu, Bai Yang Wang, Kyuho Lee, Abhishek Nag, Yi-De Chuang, Cheng-Tai Kuo, Sang-Jun Lee, Brian Moritz, Thomas P. Devereaux, Zhi-Xun Shen, Jun-Sik Lee, Ke-Jin Zhou, Harold Y. Hwang, Wei-Sheng Lee
Summary: A charge ordering state has been observed in nickelate superconductors, which is distinct from other observed ordered states. The results suggest that strong electronic correlations may be responsible for this ordered state, and the interplay between charge order, antiferromagnetic fluctuations, and superconductivity is an important topic in nickel-based superconductors.
Article
Engineering, Environmental
Tomohiro Iwasaki, Yasuyuki Shimamura
Summary: Perovskite-type lanthanum nickelate nanoparticles were synthesized and used as an adsorbent for removing organic dyes from water solutions. The presence of coexisting anions and the amount of flux in the precursor affected the formation of LaNiO3. The LaNiO3 nanoparticles showed high adsorption capacity for anionic dyes.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Biomedical
Daniel Yoon, Margrethe Ruding, Charlotte A. Guertler, Ruth J. Okamoto, Philip Bayly
Summary: The study aims to design, fabricate, and characterize hydrogel lattice structures with consistent, controllable, anisotropic mechanical properties. Lattices made of three different unit-cell types were printed using stereolithography (SLA) of polyethylene glycol diacrylate (PEGDA). The mechanical properties of the scaled lattices were measured in shear and compression and compared to those of the unscaled lattices.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Physical
Jane Banner, Ayesha Akter, Ruofan Wang, John Pietras, Soumitra Sulekar, Olga A. Marina, Srikanth Gopalan
Summary: The study reports the electrochemical performance and chemical stability of composite rare-earth nickelate-rare-earth doped ceria oxygen electrodes with high levels of rare-earth doping, including comparisons with other electrodes in SOFC and SOEC modes, demonstrating higher current density.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Luyan Wang, Yueguang Yu, Peng Zhang, Jiancan Yang
Summary: This paper investigates the preparation process of lanthanum-doped tungsten wire and provides the optimal process parameters, including temperature, compression ratio, and mold temperature. The effects of high and low temperatures on the fiber-like grains of tungsten wire are also discussed.
Article
Materials Science, Multidisciplinary
Yang Shen, Mingpu Qin, Guang-Ming Zhang
Summary: We investigated the microscopic mechanism of charge order in the parent compound of infinite-layer nickelate superconductors using a minimal three-legged model. Our findings suggest that the presence of a free electron chain enhances the charge order observed in undoped nickelates, leading to a long-range charge order with period 3. The spin excitation has a small energy gap and the electron pair-pair correlation indicates an instability of superconductivity even at half-filling.
Article
Physics, Multidisciplinary
Jiarui Li, Robert J. Green, Zhen Zhang, Ronny Sutarto, Jerzy T. Sadowski, Zhihai Zhu, Grace Zhang, Da Zhou, Yifei Sun, Feizhou He, Shriram Ramanathan, Riccardo Comin
Summary: The study found that oxygen vacancies rapidly alter the electronic configuration within the Ni and O orbital manifolds, but in RENiO3-x, antiferromagnetic order is remarkably robust to substantial levels of carrier doping, up to 0.21 e(-) /Ni. The sudden collapse of ordered magnetism upon oxygen removal may provide a new mechanism for solid-state magnetoionic switching.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Liang Si, Paul Worm, Dachuan Chen, Karsten Held
Summary: Despite extensive experimental and theoretical efforts, understanding the magnetic and electronic properties of superconducting nickelates remains challenging due to hidden factors in the synthesized films. One possible hidden factor is the intercalation of hydrogen during the chemical reduction process. The formation of hydrogen chains in LaNiO2 superconductors may explain the observed charge order states and make synthesizing homogeneous nickelates more difficult.
Article
Physics, Multidisciplinary
Y. Shen, J. Sears, G. Fabbris, J. Li, J. Pelliciari, I Jarrige, Xi He, I Bozovic, M. Mitrano, Junjie Zhang, J. F. Mitchell, A. S. Botana, V Bisogni, M. R. Norman, S. Johnston, M. P. M. Dean
Summary: The essential electronic properties of low valence nickelates have been debated, whether they have appreciable oxygen charge-transfer character or are in a distinct Mott-Hubbard regime. Using O K-edge resonant inelastic x-ray scattering (RIXS), this study resolved the question and found that the low valence nickelate possesses mixed charge-transfer-Mott-Hubbard character. Despite a similar Coulomb repulsion, the transition-metal-oxygen hopping is larger in the nickelate, leading to a significant superexchange interaction and hole occupation of ligand O orbitals.
Article
Engineering, Mechanical
A. Casaburo, G. Petrone, V Meruane, F. Franco, S. De Rosa
Summary: The use of similitude theory in this study goes beyond predicting prototype dynamic responses, instead supporting and validating experimental measurements affected by noise. Through analyzing Aluminium Foam Sandwich (AFS) plates with Digital Image Correlation (DIC) cameras and applying the SAMSARA similitude method, researchers were able to demonstrate the reliability of measurements when spatial patterns in resonance were recognizable. Similitude methods serve as a valuable tool in determining the quality of measurements and should not be overlooked in analyzing noisy data.
EXPERIMENTAL TECHNIQUES
(2022)
Article
Engineering, Mechanical
Alessandro Casaburo, Giuseppe Petrone, Viviana Meruane, Francesco Franco, Sergio De Rosa
Summary: Similitude theory was introduced in the last century, allowing engineers to design scaled versions of structures using similitude methods. While traditional laws may fail in predicting dynamic behavior when similitude is distorted, artificial neural networks have proven to be robust in predicting response characteristics and model identification.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Hossein Maleki-Ghaleh, M. Hossein Siadati, Yadollah Omidi, Majid Kavanlouei, Jaleh Barar, Ali Akbari-Fakhrabadi, Khosro Adibkia, Younes Beygi-Khosrowshahi
Summary: Hydroxyapatite (HA) nanoparticles were prepared from natural bone and doped with zinc (Zn-HA) using solid state reaction method. The Zn-HA nanoparticles significantly improved stem cell osteogenic differentiation, making them a promising option for bone tissue engineering.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Analytical
Viviana Meruane, Sergio J. Yanez, Leonel Quinteros, Erick I. Saavedra Flores
Summary: This paper investigates the problem of damage detection in steel-concrete composite structures using an impact-hammer-based modal testing procedure. A mathematical formulation is adopted to identify regions where stiffness varies without the need for theoretical models, and a curvature change criterion is used to quantify stiffness reduction. A stiffness variability index is generated for multiple points on the structure, resulting in a damage distribution pattern. The effectiveness of this damage detection strategy is validated through comparison with experimental data.
Article
Spectroscopy
T. Pandiyarajan, R. Mangalaraja, B. Karthikeyan, R. Udayabhaskar, David Contreras, Selene Sepulveda-Guzman, M. A. Gracia-Pinilla
Summary: Rare earth doped ZnO nanostructures were prepared via wet chemical precipitation, showing morphological transitions and unique characteristics. XRD measurements revealed highly crystalline nature and no alteration in crystal structure by RE doping, while Raman spectra exhibited energy shifts and intensity variations. The enhanced photocatalytic activity and different decolorization efficiencies of MB were observed in RE doped ZnO compared to bare ZnO.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Biotechnology & Applied Microbiology
Devaraj Manoj, Saravanan Rajendran, F. Gracia, M. Naushad, Madhappan Santhamoorthy, Matias Soto-Moscoso, M. A. Gracia-Pinilla
Summary: Vitamins are essential for the body's proper functioning, but they must be obtained through food intake. In this study, a mesoporous structure of titanium dioxide with doped zinc oxide nanocrystals on its surface was developed for the simultaneous determination of vitamin B and vitamin C. The mesoporous structure and zinc oxide nanocrystals enhance the diffusion and electron transfer of vitamins, resulting in significantly enhanced electrochemical signal response.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Devaraj Manoj, Saravanan Rajendran, Mu. Naushad, Madhappan Santhamoorthy, F. Gracia, Matias Soto Moscoso, M. A. Gracia-Pinilla
Summary: In this study, mesoporous copper oxide (CuO) nanocrystals decorated on TiO2 nanostructures were successfully synthesized to form p-n heterojunction nanocomposites. The resulting CuO-TiO2 nanocomposite showed good electrochemical performance on modified GC electrode, enabling efficient oxidation of catechol with wide linear range and excellent sensing properties, capable of detecting catechol in real samples like lake and river water.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Devaraj Manoj, Saravanan Rajendran, F. Gracia, Sabah Ansar, Madhappan Santhamoorthy, Matias Soto-Moscoso, M. A. Gracia-Pinilla
Summary: The capacity to generate a constant signal response from an enzyme on an electrode surface has been a fascinating topic of research for the past three decades. The immobilization of dual enzymes on the electrode surface using mesoporous materials allows for high loading of enzymes and provides a protective environment, resulting in long-term stability. The utilization of a redox mediator in second-generation biosensing of hydrogen peroxide improves the selectivity and sensitivity of the sensor.
ENVIRONMENTAL RESEARCH
(2022)
Article
Materials Science, Ceramics
Ali Akbari-Fakhrabadi, Javier Quintana, Gaspar Fabrega, Sagarkumar Zalavadiya, Wakako Araki, Viviana Meruane, Paulina Valenzuela, William Gacitua
Summary: The mechanical properties of BaFeO3-δ (BFO) and BaFe0.9Zr0.1O3-δ (BFZO) oxides synthesized by sol-gel method were investigated and compared at room temperature and 850 degrees C. The results showed that Zr-doping stabilized the crystal structure of BFZO, and BFO exhibited ferroelastic behavior at room temperature. Both BFO and BFZO showed linear elastic behavior at 850 degrees C. Additionally, Zr-doping improved the creep resistance of BFO.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Luz H. Verastegui-Dominguez, Nora Elizondo-Villarreal, Dora Irma Martinez-Delgado, Miguel Angel Gracia-Pinilla
Summary: In this study, reduced graphene oxide (RGO) was obtained through green synthesis using extracts from Larrea tridentata and Capsicum Chinense. The RGO precursor, synthesized via a modified Hummers' method and reduced using natural extracts, showed a promising potential in photocatalytic degradation of dyes, achieving high degradation efficiencies.
Article
Engineering, Manufacturing
Ivan Gonzalez Perez, Viviana Meruane, Patricio F. Mendez
Summary: Gas metal arc welding (GMAW) is a widely used metal-joining method in industrial manufacturing. The metal-transfer process in GMAW plays a crucial role in welding quality. This study utilizes deep learning segmentation models to isolate droplets in GMAW video footage and computes their properties for dynamic characterization. The proposed fully convolutional network (FCN) approach demonstrates reliable droplet segmentation within minutes, allowing for the calculation of valuable process variables.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Ceramics
Ali Akbari-Fakhrabadi, Gaspar Fabrega, Paul Ochoa, Viviana Meruane, Paulina Valenzuela, William Gacitua
Summary: The effect of La and/or Nb doping on the structure and elastic behavior of BaFeO3 at room temperature and 850 degrees C was studied and compared. It was found that Nb doping hindered grain growth during sintering. La doping was shown to be more effective than Nb doping in stabilizing the high temperature symmetric cubic structure. Both La and Nb doping improved the creep resistance of BaFeO3-3-5.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Environmental
C. Ashina, N. Pugazhenthiran, P. Sathishkumar, M. Selvaraj, Mohammed A. Assiri, Chandrasekaran Rajasekaran, M. A. Gracia-Pinilla, R. V. Mangalaraja
Summary: In this study, Ni@NiFe2O4/TiO2 magnetic nanocomposites were prepared via a simple sonochemical route, and they showed excellent photocatalytic activity and activation of peroxymonosulphate under direct solar light irradiation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Norma A. Ramos-Delgado, Diego A. Pino-Sandoval, Khirbet Lopez-Velazquez, Christos Englezos, Minerva Villanueva-Rodriguezc, Miguel A. Gracia-Pinilla, Nicolas D. Boscher, Han J. G. E. Gardeniers, Arturo Susarrey-Arce
Summary: This study demonstrates the degradation of acetaminophen in water using Fe-BiOBr and solar photo-Fenton process. The results show that Fe-BiOBr is capable of efficiently degrading acetaminophen under mild pH conditions and natural sunlight irradiation.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
